公开(公告)号：US5751769A

公开(公告)日：1998-05-12

申请号：US734879

申请日：1996-10-22

申请人： James Pressey ,  Richard Koralek ,  Francis J. Smith

发明人： James Pressey ,  Richard Koralek ,  Francis J. Smith

IPC分类号： H03H21/00 ,  H04L25/03 ,  H03H7/30 ,  H03K5/139

CPC分类号： H04L25/03044 ,  H03H21/0012

摘要： An equalizer that mitigates both linear and nonlinear distortions for amplitude phase keyed signals that are processed thereby. Algorithms employed in the equalizer are based on correcting received signals based on symbol transitions between successive symbols. The linear portion of the equalizer is programmable and can use any available algorithm. Programmable linear taps of the equalizer may be programmed in a nonlinear manner by using the lookup tables as amplitude dependent equalizers that are used to process one symbol at a time. In the equalizer, each amplitude level has it's own correction factor by using amplitude dependent coefficients. The equalizer can implement both linear and nonlinear equalization. Equalizer corrections are implemented using predetermined values stored in lookup tables. The equalization corrections are determined in an external computer and are loaded into the lookup tables for each amplitude level of the received signals. The equalizer is programmable and may be used with any amplitude phase keyed signal by reprogramming the lookup tables from the external computer for the desired modulation.

摘要翻译： 一种均衡器，用于减轻由此处理的幅度相位键控信号的线性和非线性失真。 在均衡器中使用的算法基于基于连续符号之间的符号转换校正接收信号。 均衡器的线性部分是可编程的，可以使用任何可用的算法。 均衡器的可编程线性抽头可以通过使用查找表作为用于一次处理一个符号的幅度相关均衡器以非线性方式编程。 在均衡器中，每个振幅电平通过使用幅度相关系数具有自己的校正因子。 均衡器可以实现线性和非线性均衡。 使用存储在查找表中的预定值来实现均衡器校正。 在外部计算机中确定均衡校正，并且对于接收信号的每个幅度电平将其加载到查找表中。 均衡器是可编程的，并且可以与任何幅度相位键控信号一起使用，通过从外部计算机重新编程查找表用于期望的调制。

公开(公告)号：US5867071A

公开(公告)日：1999-02-02

申请号：US911677

申请日：1997-08-15

申请人： Frank Chethik

发明人： Frank Chethik

IPC分类号： H03C3/40 ,  H04L27/36 ,  H03C3/00

CPC分类号： H04L27/362 ,  H03C3/40

摘要： A high power RF transmitter that uses high power modulators that perform quadrature amplitude modulation (QAM) on a carrier signal after power amplification that is performed in the RF carrier source. The present invention transposes the locations of the modulators and power amplifier, and thus directly modulates a high power carrier signal. An RF carrier source generates a high power RF carrier signal that is split by a power splitter. A lookup table containing 2.sup.B words by K bits receives transmit data and mapping data and generates K-tuple modulating data. A plurality of phase key modulators are respectively coupled to outputs of the power splitter and to the lookup table and phase key modulate each of the signal components of the carrier signal using the K-tuple modulating data. A power combiner is coupled to outputs of the phase key modulators for outputting a high power QAM constellation from the transmitter.

摘要翻译： 一种高功率RF发射机，其使用在RF载波源中执行的功率放大之后在载波信号上执行正交幅度调制（QAM）的大功率调制器。 本发明转置了调制器和功率放大器的位置，从而直接调制高功率载波信号。 RF载波源产生被功率分配器分离的高功率RF载波信号。 通过K位包含2B个字的查找表接收发送数据和映射数据并生成K元组调制数据。 多个相位键调制器分别耦合到功率分配器的输出，并且使用K元组调制数据耦合到查找表和相位键调制载波信号的每个信号分量。 功率组合器耦合到相位键调制器的输出，用于从发射器输出高功率QAM星座。